The reason for the crash that claimed 50 lives remains unknown, although technical malfunction and pilot error are the leading theories, Russia Today reported.

The footage shows just how futile any efforts at rectifying the situation must have been in those final moments. The plane is seen to be falling vertically out of the sky before exploding on the runway.

“We will not land” were the last words that chief pilot Rustem Salikhov told an air traffic controller at the airport.

"The plane simply fell. It went vertically into the ground. After the plane hit the ground there was an explosion," transport minister Maksim Sokolov said.

As experts examined the crash scene, they reportedly confirmed that the airliner began spinning before hitting the ground. They believe the fuselage is buried four meters underground.

“Practically half of the aircraft was in the ground,” Life News quoted a source as saying.

This complicates the recovery operation, as the bodies of the two pilots and those who traveled in business class are underground, along with half the cabin.

Parts of the fuselage, which is now in tatters, were scattered within a 2.5 kilometer radius. The plane's back was completely ruined.